640000429443 has 16 divisors (see below), whose sum is σ = 948997664160. Its totient is φ = 426284957088.

The previous prime is 640000429423. The next prime is 640000429507. The reversal of 640000429443 is 344924000046.

640000429443 is a `hidden beast` number, since 640 + 0 + 0 + 0 + 4 + 2 + 9 + 4 + 4 + 3 = 666.

640000429443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640000429443 - 2⁶ = 640000429379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640000429398 and 640000429407.

It is not an unprimeable number, because it can be changed into a prime (640000429403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10580280 + ... + 10640597.

It is an arithmetic number, because the mean of its divisors is an integer number (59312354010).

Almost surely, 2^640000429443 is an apocalyptic number.

640000429443 is a deficient number, since it is larger than the sum of its proper divisors (308997234717).

640000429443 is a wasteful number, since it uses less digits than its factorization.

640000429443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21222003 (or 21221997 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 640000429443 its reverse (344924000046), we get a palindrome (984924429489).

The spelling of 640000429443 in words is "six hundred forty billion, four hundred twenty-nine thousand, four hundred forty-three".